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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796f55794a3cbe4b2673f6b0c75e405a05b5494cfe021f5dfe7c3133d85dc47b' 
  AND token = '5HMEPbPSfQ5qwpTMV9/ivNiLPQK9/EbjhytYUZBflxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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