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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6bdc4a111e97d2a52c750041071f7ff5e258bf999a4d1ef3e89bec6bc19877' 
  AND token = 'I4CwORn1shTrn02UAIpJuXfDsKlFlMs7EQsv4M5g+fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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