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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ad983b70285169ed2b51c9f4178965b545aa9e8fb9070eeee71962e0fd9a03' 
  AND token = 'wgyx8SGJbCtoYohtMSzQAOzXoR98OjVetLkZd1i81yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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