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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6f0e08fcf6a8a4cea216f362733e3b8b73dad9dba962e79c3cd83073a708ec' 
  AND token = 'SLLcppjlHCCcZz8uZq/qqE6AtNkNiUVjL/SeyQPwNWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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