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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d322a9169cb30f3ab93cc610c6d5621167d1563ac1908e092440a5d94f03435' 
  AND token = 't2c1UpbirDCfEo11Fy6E5fIqrtNBJoqkhrgmlqTTSVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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