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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b98a7794e7ff0c660b9ea4705e703f2ab8f32a6237036f6d489f22a968d94f' 
  AND token = 'r01fFoHTNgYLSkKrORkZYNGE7R96B+sV/gA8iChqmt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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