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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c342f949aec4d4c12e52acb2baa569069f9919b80c29f3d0384bcad282150d3' 
  AND token = 'aocDfbp+EuaMymBmbqcpX1lAdBG3q33LY81dapRNb4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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