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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0979b09830945e07c445409c9fa44e9973c24f2a23db3a4fa519d539df0e578b' 
  AND token = 't/JhvdP5EPOfV6SOJ9cRmcpSeP/nnFxlumoa21WUmvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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