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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dadf4c1dbe75823a3a0c492e6feef3b3edcf696672c0eadf83e663d98b673c' 
  AND token = '+Seact2r1PHlgXZCXgMKuhzM71NFsku82CkMSj5aKOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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