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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c794d922acede5149e2b787cbf1a0115b8628d0d9bfd9fdb3237fbb0fcf2ffd4' 
  AND token = 'PirJjyTWCiiudHHRGmry+swJOUCqtzwuQr6KI5f2cUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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