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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7c7bf179bbed44307e7896dba29e64c260c67369ff9c932cea803c733668ef' 
  AND token = 'wBvNUWf81H4P8MJ7qB4u7sHB5l5NVbC6wb/xpgR8ZF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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