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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1da7248b6da83b38953da3c939178a1273d39ba034d024380e411fb8d27b5f0' 
  AND token = 'qX4xrffR8BXzZwV64T0ZbdNre9wyY4mBJtUrq8SIb/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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