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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f738d5c668b8675ae7eb1afeedd9e45e1b5e54aa94f98a5190b667c1223b48a2' 
  AND token = 'TNZPEUWSOdCZTIM8Rxdt/s7TEhf1QFIA72ZHXvvSikE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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