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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a828c5ee75454bd8e1e971b6345afe203800cbb1ce9444e52caed88587b4a8' 
  AND token = 'N89qzjByfwd6JGIZZixAi95rREIzr8DfP80KVkDlI14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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