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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee227327f8df5a0e6573a3659c3a6453587ffa31d4c5f7b8d96543c70506936' 
  AND token = 'DIQo6fI/tyV6BfUQ2Jp5RFbQmc9ota8+m1rFazUPJo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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