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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cbd329a2e202e9cedb0cd3d597abf78f9d83a0e9c78bd1efd1d52f0dcba2ef' 
  AND token = 'ZjFskxr/hBtsRIJViq9AdIOC/CAjPz7daSeVg9F+z+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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