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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5bc49b5e6067fe0edf38cd40ec45c0a2fed123bd647fe498dbe848fb0649bb' 
  AND token = 'ogKjsVdwZoZdlK5yXUtOUT86KyhLKJahk1+Xq9Zz35s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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