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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c162871a68ec93e2d5c7ab349f222e744b5dd297cb91b2bec9e3831b4911d2' 
  AND token = 'hZAvoXgw/pVcT7IO0WADEtLPpM2YH8nhRV8QBf7gikE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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