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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4317444e7b63168164ee1cc3d1032b4e1788ff984841e578a243cb0131bdc134' 
  AND token = '6JgTrayRnC16nJHsIpt8sJrwgwmzZncSBrtkDuP0i4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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