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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2a2e79f6c889687e252f04206e0233809416afea5c3a8b3f820ac94f9a67ea' 
  AND token = '5+KRQC1ylF1W1ON1gJqHozKEl+1hyWl+mfnoKV9c+Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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