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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a68b029a0a8fa69355ede51ab5d16646ae6887f85e8665907868926a943b32' 
  AND token = 'p3OKvXg0DeJRp6bdrSfZmfrq5thUPYO2A15Dv4HMYQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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