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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f193348fe33e97d10c921b2f5cce4f233cf799c519cd1cc35584ed3746c1127' 
  AND token = 'X4hF90e8gKgL3LHqvty4+3YutSe6dEAIvQUmWhj2cao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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