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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6136dcf14f08f9c4aab977de972e3c5df6057d5ee686b9226c7cbc9a1ef23e' 
  AND token = 'Zf3BhgNFZZLq1VxN1XZa7Y50eDcaHz8IVuctiJjlOAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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