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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a068b663b133d5e429c88ab21ba0e0493b3724320a97bced902ef5488a846d6' 
  AND token = 'wfTSeJmh/PkubOGDYljO3ueq2AZdLwi5Vku7r94YgaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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