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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a41695d63de06a6265a09d52be29d9fe4a3830d7bfade1f45ff12ceca7efbb4' 
  AND token = 'y8WMKKMxwm3FnIr3prDHeH/pSi4vwjQNGoQOTu2OuaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00268

JSON explain

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