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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156f760946f5efcce224d3ffd939ad088f7d1e658c81c6886a3dff9f6861823c' 
  AND token = '77/omADFtwl12rY3GHjCnsyBGyq1ECq9Q2feSgjoNP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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