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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fa650e28c1ee450a1be015cfac0a4eb397d01ee08446a03f6816c008c760ba' 
  AND token = 'CUfP9FsKnlhmmgVK5AjCUvm25pXCS2nZye9NuMynstQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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