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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ae4e792551695074968376a04a0a554718ef66fd0c59a4859d30b2450e4839' 
  AND token = '7LoCt9SU7mNxnFM50hcEI5qSUL8vLtiJeX5gjzEZ1nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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