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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36a51ce296ca3c4c15f566d2a8d2d6145cc4520a8c2bf1058322832553fca7b' 
  AND token = 'u8kM+ZKKgesga2fhveHVbDw2aJQO0/6h5K08l3EqePk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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