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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32bb1da803f33b87cc108468aae883d4debda1df5d5eb6f9e85a5600f52968b' 
  AND token = '7+Bykn24xDpWl/etFDBxGbmo+CC2Iwcah/dp/ivEBJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}