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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2007b10e838ce50070a5af9f7e3cd0b3a17fa253df293cda85a9d353f908394b' 
  AND token = '0dz81AOSU4l6IsobyOAh7g1rwjAK+HL/SuPEc9kZYEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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