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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c1e07e5f770b9d01b7ac2c7132e987a85f84a77ae7cb48633b88de09cd9ca8' 
  AND token = 'DVG5pLVacFud6I57/s3ftGzXCLq45s/lTy43fhyObhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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