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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a79df92a658467397aed333e3cf08ef1ac0b34dedc38c07f74b2913f25954ff' 
  AND token = 'hM57g19ktrSNOQTUTa3JKkdr/uXPa45unHBA7Q3A6hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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