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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b04d71b5aeb7fee012b7cfd4a1acd4c301c4763304b1639db8780d6dab2b96e' 
  AND token = 'CBi1ZIfaEpSRMqGq6kYA9EhixTj4h4/JHpSeDZ0Dwj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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