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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70cafa4a8d26be2242b1ccaffd9c67e60f756627073c16e1f38f47beef84a36' 
  AND token = 'Q6Im6UOrxHkzVHbt3X7OQesMGhxgGC2DBW9bQSm5grY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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