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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c45209b585da2e830f5e1cc24771987058ff0894271cf08ec3e49e8a0cf548' 
  AND token = 'hDJ57tbHFe8z9P97hBI5SAfMq5J/1YFb9BPQXdAOCWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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