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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714f13c4f21ac2dc91485ccd98ead8a0f6f2fad223ef6762b2d289ab26cf9e0e' 
  AND token = 'cR6ykl7mF5GKJgN4kTfOHOo+/7QADMlaOOFT3ZCGT1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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