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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe03303b9e4d948d7da8df79b30954d2aadbc6b6e090bd6949c5338ff886ffca' 
  AND token = 'PrdsGrBd4UtqwoaeGDRyRaoI/vtXoAydZqgwewkoGV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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