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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3671e000c2fd53513bb40b9e646f26457506ad3b31d0e18a49d72ead451f75' 
  AND token = '+OkiX78IDMdJegk4Gup+xN6+F42Iv0hFCgyqg93HD/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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