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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb571b3c311e99e474819e03a2a169f2252dc84b42c4d2c2cf5e8116a3bbb9ad' 
  AND token = 'OBsgbffn6GObV/Nko3u6jyp2B6ZAzjuH004zqV6pIFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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