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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8777cdcada4df1c048ac8bab7f0ffcc2a40c1ae55ac187864a7dae9b8387b5a9' 
  AND token = 'hIwyzMTmktX1rdR5rZqf347113ZegwIIXrIT7FInPOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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