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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a32dadf5ff24dd3ae860f2dab993087e10e48acd52c993b41382a18c3a1073' 
  AND token = 'bxgx7eyyxC01vxvpuEXa/yshYj2puA60So3jN7MQuqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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