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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfe285a5fab2b93cc6b8c37b1927df7dbc44ce727f40ed1ffb07abac8e77b7e' 
  AND token = 'DydffRaOZ/QGq4Yq1gQkp1agQ9VaUoT/R2KClKHPf+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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