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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731b7ea3100b6e27ad8a7226b70c371e44a41f90d750b186c21ab903205468bf' 
  AND token = 'q93SVS+gKA8l51aPISgh/aaHUX3vOVl7UfKauz7pNt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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