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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eea226f5aaeb9247d59e6e80c9f9b38b1cf2e114cbea5dd715fda790597f22' 
  AND token = '2MRlultuNLyVPJcVNUERRcvFaj5EkWdyceH4uNvmIGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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