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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e27c9e7c81c05b917a2021c6c5ad1e463ae7445e43c8341a7ba8dc595988e03' 
  AND token = 'hjd23qseuKKsojW06SJU52eKPL3hj+pOot7X3pS0h3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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