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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc8ee8f7e7da7f1975a6c6e41ab50beddbcb6d1848bb35f0f54c20fef6e4689' 
  AND token = 'hSb3myn6O3KTaTv135UzB0f6+8LKKwRj4RWgZF33bDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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