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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4ade04c02c8f4d260dcb770be38aa7538b60e78edc723b7e860d0baa013cc6' 
  AND token = 'ye8kh7O6Ec/mvLLMLAcFuIR8BE7i/Oyaf6uZrcPOVew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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