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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc7f90d8c75f1098cd741b4ea5579d4d3f7241067ca11ea02040bf1c2dd916a' 
  AND token = 'WQ1Uf8MGO2KkCNk065WZM/owrke/Zew+oegubW5WeTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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