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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22d065e9dbe558d395962d5af2432474c24328f29f1b3e2e6a13fe68f52e5d1' 
  AND token = 'HiyEg5klVUjZ1WqtnK/LGMMMNKTHq2NmS1LDuW3Sqgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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