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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931cb5da163f225bbddbfdda416452283df35775ed841073dfd30be358c08b27' 
  AND token = 'TGRmzRbuVN7ccvIR46GzCgD/Qlk9Np+KtwEA8TlKQeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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