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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87242e9963f433b785055b7e26ed559fb01d7bb9930c1bb201e6edfa649e66a5' 
  AND token = 'BNePn0w6P2C8vlnDGWGHhwUwqi5CfjE/tfP4708BHyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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