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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5c6c7e2434ad7f79e5f41fc5e4bcf78bfcfe67c2ec2ca123fa305fec3d8010' 
  AND token = 'tb1va3z/xXXoz9IsjR0PDElvtY9JKxvnprrQUM6Kh5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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