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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d2a710646743405789ab9f18d3228260cb20ad5bb5bff46574c578cd046086' 
  AND token = 'hjYxLB6vXy0W3xjKlDpbUt79expwY39MUrtIB4gIeY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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