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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08c7b0491364f8227c61d566e0664186c7384642589ef1e9c38648404393d7f' 
  AND token = 'ILDG21n3NecuaqGSKJ4NeyzKujZ9xPJyssas3YGoOfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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