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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07c75df281e28a0cd22c8f9e8dd75e1c181a7450f57e16d4b6f760bc7cb3ad5' 
  AND token = 'kxjEQ5p9CQK2mbntgLXrUqKmAkCYR+wjrAg9jXOl2Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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