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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8e5fc2c81462f1a29ccdce6635098dc7f45b0c34c8b56da04a24bb1d43b5bd' 
  AND token = 'fVAGHh6X2z7r5dxxygmhDc0J6l3N2J6AVS/zzTDcMWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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