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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df614a7962543f044d7a1cbd0a7e7e6e87e3886f5ec2f0982e2942ec6402aae8' 
  AND token = 'xIkjw2Komt+ry2QGNkJz5p28vU87476hoOkeTvUCK0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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