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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dd060a57c98c90c912b2c0132cdd85f74bf487f56cc81cd6de6eab5b57fa1c' 
  AND token = '8i/0cYRNeX2Y7HVFuqSZwJcksANrIKJQ3QJw/8BFkiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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