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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f97f1d0b5e7cb035683b408b90d4c7528afc6e14512ce6e70f73e127098fce' 
  AND token = 'mXAG/qSumwSbLEmRHtWMuNOaGQAcZE3oBouk65zMY3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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