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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa2c99d1db0ceba6ae3b0f71e55c624f8ee314f85dc002062ea70d49c32bb9f' 
  AND token = 'MBiDERa5XZLhr20Iq5aJFRiSa4kLIMkogb2WtXdNFEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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