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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7ff0e7d17a7071364b4b15aea3c2a73a24d6a607aa4d85ee70c101c148244c' 
  AND token = 'S8uXuCJ/byfAUr1X7+yEPPGweuyecNOFhz4+oMz1aeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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