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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3fc40cd1cb9993671b693a3a79d172129072ed2b138745ac4d5bb1fb4ae8ae9' 
  AND token = 'I42jAM/OjaykPwFvnkJgTsANhLgPfkjsnTGPDHEzs8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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